Numbers problem

[user2582]

Answer key says C
I chose B
PLEASE EXPLAIN

[Leaderboard]

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Welcome to the forums! Since GregMat (who is a very chill person) doesn’t have any specific formatting rules when it comes to asking questions on the forums, I feel like there should at least be a reference text of some sort that can help people ask better questions and make the process more enjoyable for those who try to answer them. The Golden Rule: Imagine You’re Trying To Answer the Question Before you post your question about GRE preparation, practice questions, or strategies, try to put y…

[cylverixxx]

Gotta show your work cuz only you’re the only person that knows the logic behind why you chose B

[user2582]

So 3 units digits 3 9 7 1, and 900 is divisible by 4 thus the remainder when divided by 4 is 1

For 2 units digit 2 4 8 6 and 600 is divisible by 4 this the reminder when divided by 7 is 6

Please tell me where am i wrong

[cylverixxx]

Yeah well there’s no “unit digits” here cuz we’re dividing by numbers aside from 10. We only care about “unit digits” when we’re dividing by 10.

[user2582]

Didn’t follow this explanation

[cylverixxx]

Your strategy of focusing on the ‘unit digit’ makes little sense unless your question specifically asks for the remainder after division by 10. Effectively, you should be looking to employ another strategy to attempt this problem. Do you have one in mind?